Electric-lamp socket.



J". H. GOBHST. ELECTRIC LAMP socK'ET.

APPLIGATION FILED NOV. 7, 1910.

, Patented Feb. 13,1912.

2 SHEETS-SHEET 1.

J. H. GOBHS'T.

ELECTRIC LAMP SOCKET.

APPLICATION FILED NOV. '7, 1910.

1,017,260. Patented Feb. 13, 1912.

2 SHEETS-SHEET 2.

UNITED dTATES PATENT OFFICE.

JOHN H. GOEHST, OF CHICAGO, ILLINOIS, ASSIGNOR TO FEDERAL ELECTRICCOMPANY, OF CHICAGO. ILLINOIS, A CORPORATION OF ILLINOIS.

ELECTRIC-LAMP SOCKET.

Specification of Letters Patent.

Patented Feb. 13, 1912.

Applicatioirfiled November 7, 1910. Serial No. 591,009.

reference marked thereor u hich term a part of this s )ecitication.

This inventionrelates to an improvement in electric light sockets, andthe object of the invention is to provide a water-proof socket of simpleand economical construction, and one which may be readily and quicklyattached to a supporting arm without twisting the conductor wires andwith out any danger of damaging the binding posts when securing theparts in place.

The invention consists of the matters hereinafter described and moreparticularly pointed out in the appended claims.

In the drawings :-ligure 1.is a side cle vation of my improved socketshown attached to supporting arm. eig. 2 a bottom plan View of the same.Fig. is a vertical scctionaL view through the socket and the lower endof its supporting arm on the line 33 of Fig. 2. Fig. l is a verticalsectional vicwon the line {i to'l Fig. 2. Fig. is a transverse sectionthrough Fig. 1 on the line thereof. Fig. 6 is a top plan view of theupper insulation block of the socket. Fig. 7 is a vertical sectionthrough Fig. 6 on-the line 77 thereof. Fig. 8 is a sectional sideelevation showing a shade at tached to my socket.

In that embodiment of my invention illustrated in the drawings, 10indicates the pipe which comprises the supporting arm for the socket andthrough which the conductor wires are led to the socket.

11 indicates the socket as a whole. socket embraces a terminal andcontact supporting insulating block 12, an insulating tubular block 13which incloses the threaded contact shell, and a. metallic shell member1% by means of which the two insulating blocks 12 and 13 are securedtogether, and which serves as the means for attaching the socket to thethreaded end of the pipe 10. The block 12 made of porcelain or other Isuitable insulating material and comprises The an annular base 12provided on its lower face with a central boss 12 to which are secured,in any usual or convenient manner, a. shell contact 15 and a centralcontact 16. The upper edge 12 of said disk is preferably rounded incross-section, and is provided with a plurality of radially disposednotches 12. The metallic shell 14 has a dome-shaped body 14L formed toprovide a chamber to receive the base 12 of the insulating block 12, andis indented to form rounded shoulders 14: on its inner surface which areadapted to engage within'the notches 12 of said block. Above saiddomeshaped body the shell member 14 is provided with a tubular extension14L Within which secured an internally threaded, reinforcing ring let,adapt-ed to be screwed upon the threaded end 10 of the pipe 10. As shownin the drawings, said ring 1 1 has an annular groove 14 formed in itsouter surface and the wall of the tubular exten sion is spun into saidgroove to secure the parts together.

T he upper end of the tubular insulating block 13 engages against themargin of the lower face of the base 12 of the block 12, and has anexternal screw-thread 13* which engages with an internal thread 14formed in the shell member 14. The upper end of said tubular block 13 isrecessed as indicated at 13" torccoive the boss 12 of the block 12.

Said recess terminates in an annular shoulder 13 on the inner surface ofthe tubular block, which shoulder abuts against the lower face of saidboss 12*.

In the top of the block 12 is formed a recess 12 and communicating withsaid recess at each end are apertures 12, 12 ex tending through theblock for the passage of line wires, 17, 181, which are connected tooppositely disposed binding screws 17, 18 screwed transvei'scly into theboss 12? which is cut away at the points where said binding screws areattached so that said screws will be located well within the recess 13*of the tubular block 13 without danger of contact between said screwsand block.

The manner of assembling the sockets is as follows: Theshell 14 is firstscrewed upon the threaded end of the arm 10. The wires" 17, 18 are thendrawn down and inserted through the apertures 12, 12 of the insulatingblock 12 and connected to the screws 17, 18 The block 12 is then pushedup into the shell member 14, and is shifted or turned slightly in orderto engage the notches 12 with the shoulders let formed on the innersurface of said shell. The tubular block 13 is then screwed into thethreaded end of the shell member 14, until it engages with the block 12in the manner described.

It will be noted that in this socket in assembling it and in attachingit in place, there is no twisting of the wires, and the binding screwsand parts are so arranged that in screwing the parts together no movingpart is caused to rub aga nst said binding screws.

In Fig. 8 is illustrated an improved shade holder particularly adaptedfor use with my improved socket. 25 indicates the shade holder and 26the shade or globe supported thereby The shade holder 25 has a dependingflange 25 carrying the usual set screws 25* which engage within theusual annular groove 26 formed at the top of the shade 26. Said shadeholder also has a central tubular extension 25 which has an internalthread 25 The shell let of the socket has an external thread 143 adaptedto be engaged by the thread 25 of the shade holder. The shade holder maythus be screwed upon the socket. This construction furnishes a simpleand economical construction for attaching the shade since, by reason ofthe thinness of the shell 14, the internal thread 14 and the externalthread 14' may be readily formed by the same operation.

I claim as my invention 1. A socket embracing a hollow shell memberadapted to be attached to a support and provided with an internal threadat its lower end, an insulating bloc-l: adapted to fit within said shellmember and to which are secured a center contact and a shell contacttogether with their associated binding posts, said insulating blockhaving apertures for the passage of the conductor wires, said shellmember and insulating block be ing provided with engaging parts adaptedto prevent rotation of said block with retcrence to said shell member,and a tubular insulating block surrounding said contacts and saidbinding posts and adapted to engage at its upper end against saidinsulating block, said tubular block being provided with an externalthread adapted to engage withcthe internal thread of said-shell memher.

2. A socket embracing a hollowshell member having a dome shaped body provided at its lower end with an internal screw-thread and having atubular inter nallv threaded extension at its top, an insulating blockadapted to fit within said dome-shaped body of the shell member andprovided with apertures for the line wires, said insulating block andshell mrnnberbcing provided with engaging parts adapted. to prevent theblock from rotating with reference to the sliellunember, said block being provided with a central boss to which are secured a center contactand a shell con tact and their associated binding posts, and a tubularinsulating block surrounding said contacts and binding posts andengaging at its upper end against the lower face'of said insulatingblock, said tubular block being provided with an external thread adaptedto engage with the internal thread. at the lower end of said shellmember.

A socket embracinga hollow shell mem her having a domeshaped bodyprovided at its lower end with an internal screw-thread and having atubular extension at its top,

an internally threaded, reinforcing ring secured within. said tubularextension, an insulating block embracing a base conformed to fit withinthe dome-shaped body of said shell member, and a central boss, said insulating block and said shell member having engaging parts adapted toprevent the rotation of one with reference to the other, said boss beingcut away at its opposite sides and said insulating block being providedwith oppositely disposed apertures for the conductor wires, a centercontact: and a shell contact secured to said boss, associated bindins;posts secured to said insulating block adjacent said apertures at thepoints where said boss is cut away, and a tubular insulat lug blockrecessed at its upper end to receive said boss and engaging at its upperend against said insulating block, said tubular block being providedwith a thread adapted to engage with the internal thread at the lowerend of said shell. member.

4:. A socket embracing a hollow shell member adapted to be attached to asupport and provided with an internal and external thread at its lowerend, an insulating block adapted. to fit within said shell member and towhich is secured a center contactand a shell contact, together withtheir associated binding posts, said insulating block having aperturesfor the passage pt the conductor wires, said shell member and insulatingblock being provided with engaging parts adapted to prevent rotation ofsaid block with reference to said shell member, and a tubular insulatingblock surrounding said contacts and said binding posts and adapted toengage at its upper end against said insulat ing block, sa1d tubularblock being pro vided with an external thread adapted to engage with theinternal thread of said shell member.

5. A. socket embracing a hollow shell member adapted to be attached to asupport atits upper end, an insulating block adapted to lit within saidshell member and to which is secured a center contact and a shellcontact, together with their associated binding posts, said insulatingblock having block adapted to engage the lower end of apertures for thepassage of the conductor said shell member. I

wires, said shell member and insulating In testimony, that I, claim theforegoing block being provided wit-h means adapted as my invention 1atfix my signature in the 5 ,to prevent rotation of said block withrefpresence of two witnesses, this 24th day of 15 erence to said shellmember, and a tubular October A. D. 1910.

insulating block surrounding said contacts JOHN H. GOEHST; and saidbinding posts adapted to engage Witnesses: at its upper I end againstsaid insulating GEORGE R. WILKINS,

1?; block, and means provided onsaid tubular T. H. ALFREDS.

